CN104591333A - In-situ oxidation iron plating arsenic removal process based on quartz sand supporting - Google Patents
In-situ oxidation iron plating arsenic removal process based on quartz sand supporting Download PDFInfo
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- CN104591333A CN104591333A CN201410783853.7A CN201410783853A CN104591333A CN 104591333 A CN104591333 A CN 104591333A CN 201410783853 A CN201410783853 A CN 201410783853A CN 104591333 A CN104591333 A CN 104591333A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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- Water Treatment By Sorption (AREA)
Abstract
The invention provides an in-situ oxidation iron plating arsenic removal process based on quartz sand supporting and relates to an arsenic removal method. According to the arsenic removal process, a FeSO4 solution, oxygen-free deionized water and a NaClO solution are alternately injected into a chromatographic column in a four-step injection cycle, and NaClO is oxidized by Fe<2+> in the experimental column to form a quartz sand supported ferric oxide/hydroxide coating on the surface of the quartz sand. Meanwhile, in order to avoid the formation of lots of precipitates at a water inlet to block the water inlet, the oxygen-free deionized water is introduced between the FeSO4 solution and the NaClO solution for buffering and evenly dispersed in the chromatographic column (experimental column) for reacting to form the uniform ferric oxide/hydroxide coating on the surface of the quartz sand. The process is not only good in arsenic removal effect and free from secondary pollution, and also has the advantages of low cost and simple process; besides, a beneficial idea for further popularization and application in the wild can be provided.
Description
Technical field
The present invention relates to a kind of dearsenicating method, particularly relate to the in-situ oxidation plating iron arsenic removal process based on quartz sand load, belong to underground water in-situ immobilization and purification techniques field.
Background technology
Arsenic is a kind of toxic element of occurring in nature, all be found in natural multi mineral, under the impact of specific geologic condition, geochemical conditions, hydrogeological conditions and human factor, arsenic in rock and settling also can enter in underground water, makes arsenic from underwater content there will be higher phenomenon.High-arsenic underground water worldwide extensively distributes, and more than 70, whole world country is subject to the threat of high-arsenic underground water all in various degree, especially India, Bangladesh, Vietnam, Burma, Chile, Argentina, Hungary, the U.S. and China.The primary high-arsenic underground water of China is mainly distributed in Datong Basin, Shanxi Province, In The Hetao Basin, inner Mongolia and Xinjiang, Taiwan etc., and about 1,850 ten thousand populations are subject to the threat of high-arsenic underground water altogether.Long-term drinking high-arsenic underground water can cause the high-risk illness such as skin carcinoma, lung cancer.At present, serious harm is caused to the healthy of the several hundred million population in the whole world owing to drinking high-arsenic underground water.In recent years, along with the increase year by year of underground water proportion in resident's production, life, it becomes a lot of area especially northwest arid inland basin resident living water and work, topmost resource of water supply of agricultural water gradually.But the extensive distribution of high-arsenic underground water exacerbates the situation of these regional water supply and demand anxieties, seriously constrain the Sustainable development of local economy, society.Meanwhile, high-arsenic underground water is also one of the most serious geologic Environment Problem of facing of international community, has become the hot subject of environmental geology area research.
The purification way of high-arsenic underground water common at present has: oxidation reduction process, precipitation-flocculence, biological process, ion exchange method, lime softening method, membrane separation process, absorption method etc.Above method all also exists respective drawback: oxidation reduction process can produce poisonous and carcinogenic by product; Precipitation-flocculence can produce unstable mud, is more suitable for dystopy purification; Time required for biological process is long; Ion exchange method can produce new waste liquid, and the cycle is long, and organic existence meeting contaminated ion resin; Lime softening method needs to carry out secondary treatment adjustment pH etc.; Membrane separation process easily produces embolism, needs regular maintenance, and later stage running cost is very high; Absorption method needs to carry out regenerating and regularly replacing, and operation cost is high.
Summary of the invention
The object of the present invention is to provide a kind of in-situ oxidation plating iron arsenic removal process based on quartz sand load, this technique not only effect of removing arsenic good, without secondary pollution, simultaneously also there is with low cost, the simple advantage of technique.
The present invention adopts four steps to inject circulation, alter least-squares FeSO in quartz sand column
4solution, anaerobic deionized water and NaClO solution, make NaClO in chromatography column (experiment post) by Fe
2+after oxidation, form the iron oxides/hydroxides inclusion of quartz sand load at quartz sand surface; Block water-in, at FeSO in order to avoid forming a large amount of precipitation at water-in simultaneously
4introduce anaerobic deionized water as buffering with in the middle of NaClO solution, make its dispersed reaction in chromatography column (experiment post), to form even iron oxides/hydroxides coating at quartz sand surface.
For achieving the above object, the technical solution adopted in the present invention is: based on the in-situ oxidation plating iron arsenic removal process of quartz sand load, it is characterized in that comprising the following steps:
(1), to quartz sand 2, chromatography column 1 pre-treatment is carried out, stand-by;
Prepare in-situ oxidation plating iron arsenic removing apparatus: be cavity in chromatography column 1, filled stone sand 2 in cavity, the bottom of chromatography column 1 is provided with bottom, bottom is provided with outlet, exports and is connected with rising pipe, and the top of chromatography column 1 is provided with top cover, top cover is provided with entrance, entrance is connected with the outlet of liquid-inlet pipe, and liquid-inlet pipe is provided with peristaltic pump (multi-channel peristaltic pump) 3, FeSO
4naOH solution tank NaOH, deionization water pot, NaClO NaOH solution tank NaOH are connected with the entrance of liquid-inlet pipe respectively by arm, and all arms are provided with valve respectively; FeSO
4naOH solution tank NaOH is built with FeSO
4solution 4, deionization water pot built with deionized water 5, NaClO NaOH solution tank NaOH built with NaClO solution 6;
(2), the valve of closing on the arm that is connected with deionization water pot, NaClO NaOH solution tank NaOH, open and FeSO
4valve on the arm that NaOH solution tank NaOH is connected; By peristaltic pump 3 with V
0=12.1ml/min water inlet speed pumps into 2mmol/LFeSO in chromatography column 1
4solution 4 (under anaerobic condition, DO<0.1mg/L) 1min;
(3), closedown and FeSO
4valve on the arm that NaOH solution tank NaOH, NaClO NaOH solution tank NaOH are connected, opens the valve on the arm that is connected with deionization water pot; With identical water inlet speed (V
0=12.1ml/min) in chromatography column 1, pump into anaerobic deionized water 5, the time is 1min, as reductive agent FeSO
4with the buffer medium of oxygenant NaClO;
(4), closedown and FeSO
4valve on the arm that NaOH solution tank NaOH, deionization water pot are connected, opens the valve on the arm that is connected with NaClO NaOH solution tank NaOH; Do not change water inlet speed (V
0=12.1ml/min), continue to pump into 1mmol/LNaClO solution 6 in chromatography column 1, the time is 1min, and by chemical reaction equilibrium, NaClO solution is excessive pumping into, and makes it to be enough to Oxidation of Fe
2+form iron oxides/hydroxides;
(5), closedown and FeSO
4valve on the arm that NaOH solution tank NaOH, NaClO NaOH solution tank NaOH are connected, opens the valve on the arm that is connected with deionization water pot; Do not change water inlet speed (V
0=12.1ml/min), again in chromatography column 1, pump into anaerobic deionized water 5, the time is 1min;
(6), be cycled to repeat the individual step in above-mentioned (2)-(5), to chromatography column 1 quartz sand color without considerable change and in water outlet Fe content without when obviously reducing, stop (finally completing in-situ oxidation plating iron arsenic removal work).
Step (1) is described carries out pre-treatment to quartz sand 2 and is: described quartz sand, and (1), particle diameter are at 1mm and epigranular; (2), before carrying out filling out post, 3 times are cleaned respectively with tap water and deionized water with after 6mol/L HCl soaking and washing 12h, to remove impurity and the ferriferous oxide of quartz sand surface, after repeating this step 2-3 time, clean quartz sand is proceeded in deionized water and saves backup.
Step (1) is described carries out pre-treatment to chromatography column 1 and is: described chromatography column, (1), diameter 1.4cm, height 30cm; (2) chromatography column [and related accessory (as conduit etc.) is equal] uses tap water and washed with de-ionized water [then in post, to load the full quartz sand cleaned by the method for wet method dress post 3 times respectively after soaking 48h with the dilute hydrochloric acid that mass concentration is 15% ~ 20%, and ensure that experiment post is full of water completely and does not have bubble to be mixed in this dress post process, to ensure that in post, quartz sand is loaded evenly].
The present invention adopts four steps to inject circulation, alter least-squares FeSO in chromatography column
4solution, anaerobic deionized water and NaClO solution, make NaClO in experiment post by Fe
2+after oxidation, form the iron oxides/hydroxides inclusion of quartz sand load at quartz sand surface.Block water-in, at FeSO in order to avoid forming a large amount of precipitation at water-in simultaneously
4introduce anaerobic deionized water as buffering with in the middle of NaClO solution, make its dispersed reaction in chromatography column (experiment post), to form even iron oxides/hydroxides coating at quartz sand surface.
The invention has the beneficial effects as follows: in the process, the FeSO first injected
4solution with oxygenant NaClO in quartz sand surface generation in-situ oxidation reduction reaction, will generate the iron oxides/hydroxides inclusion of quartz sand load.The iron oxides/hydroxides product of quartz sand load will continue planar water arsenic by forming monodentate mononuclear complex with As, reduce the content of arsenic in water, thus reach process, improve the object of high arsenic polluted water, this technique not only effect of removing arsenic good, without secondary pollution.The method has advantage with low cost, simple on the one hand, can realize the batch preparation of arsenic removal post, application pump-and-treat system method, high-arsenic underground water is pumped into arsenic removal post with given pace and realizes fixing water arsenic, process the object of high arsenic polluted water; Simultaneously, according to the basic fundamental thought that the method is utilizing the reduction of ferrous oxide product produced in dielectric surface original position to carry out in-situ arsenic removing, also can be applied to field, realize ground water aquifer in-situ arsenic removing, there is no-dig technique, low cost, be easy to promote, the advantage of safety and stability.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the in-situ oxidation plating iron arsenic removing apparatus in the present invention.
Arsenic removal post arsenic break-through curve figure in Fig. 2 embodiment.
In figure: 1-chromatography column, 2-quartz sand, 3-peristaltic pump, 4-FeSO
4solution, 5-deionized water, 6-NaClO solution.
Embodiment
Below in conjunction with specific embodiment, detailed specific description is done to the present invention.
One, based on the in-situ oxidation plating iron arsenic removal process (or being called the preparation method of arsenic removal post) of quartz sand load, comprise the following steps:
(1), to quartz sand 2, chromatography column 1 pre-treatment is carried out, stand-by;
Describedly carry out pre-treatment to quartz sand 2 and be: described quartz sand, (1), particle diameter are at 1mm and epigranular; (2), before carrying out filling out post, 3 times are cleaned respectively with tap water and deionized water with after 6mol/L HCl soaking and washing 12h, to remove impurity and the ferriferous oxide of quartz sand surface, after repeating this step 2-3 time, clean quartz sand is proceeded in deionized water and saves backup;
Describedly pre-treatment is carried out to chromatography column 1 be: described chromatography column, (1), diameter 1.4cm, height 30cm; (2) chromatography column [and related accessory (as conduit etc.) is equal] uses tap water and washed with de-ionized water [then in post, to load the full quartz sand cleaned by the method for wet method dress post 3 times respectively after soaking 48h with the dilute hydrochloric acid that mass concentration is 15% ~ 20%, and ensure that experiment post is full of water completely and does not have bubble to be mixed in this dress post process, to ensure that in post, quartz sand is loaded evenly];
Prepare in-situ oxidation plating iron arsenic removing apparatus (as shown in Figure 1): be cavity in chromatography column 1, filled stone sand 2 in cavity, the bottom of chromatography column 1 is provided with bottom, bottom is provided with outlet, exports and is connected with rising pipe, and the top of chromatography column 1 is provided with top cover, top cover is provided with entrance, entrance is connected with the outlet of liquid-inlet pipe, and liquid-inlet pipe is provided with peristaltic pump (multi-channel peristaltic pump 3), FeSO
4naOH solution tank NaOH, deionization water pot, NaClO NaOH solution tank NaOH are connected with the entrance of liquid-inlet pipe respectively by arm, and all arms are provided with valve respectively; FeSO
4naOH solution tank NaOH is built with FeSO
4solution 4, deionization water pot built with deionized water 5, NaClO NaOH solution tank NaOH built with NaClO solution 6;
(2), the valve of closing on the arm that is connected with deionization water pot, NaClO NaOH solution tank NaOH, open and FeSO
4valve on the arm that NaOH solution tank NaOH is connected; By peristaltic pump 3 with V
0=12.1ml/min water inlet speed pumps into 2mmol/LFeSO in chromatography column 1
4solution 4 (under anaerobic condition, DO<0.1mg/L) 1min;
(3), closedown and FeSO
4valve on the arm that NaOH solution tank NaOH, NaClO NaOH solution tank NaOH are connected, opens the valve on the arm that is connected with deionization water pot; With identical water inlet speed (V
0=12.1ml/min) in chromatography column 1, pump into anaerobic deionized water 5, the time is 1min, as reductive agent FeSO
4with the buffer medium of oxygenant NaClO;
(4), closedown and FeSO
4valve on the arm that NaOH solution tank NaOH, deionization water pot are connected, opens the valve on the arm that is connected with NaClO NaOH solution tank NaOH; Do not change water inlet speed (V
0=12.1ml/min), continue to pump into 1mmol/LNaClO solution 6 in chromatography column 1, the time is 1min, and by chemical reaction equilibrium, NaClO solution is excessive pumping into, and makes it to be enough to Oxidation of Fe
2+form iron oxides/hydroxides;
(5), closedown and FeSO
4valve on the arm that NaOH solution tank NaOH, NaClO NaOH solution tank NaOH are connected, opens the valve on the arm that is connected with deionization water pot; Do not change water inlet speed (V
0=12.1ml/min), again in chromatography column 1, pump into anaerobic deionized water 5, the time is 1min;
(6) the individual step in above-mentioned (2)-(5), is cycled to repeat, and from chromatography column 1 water outlet, connect sample once at interval of 5 minutes, sample stored refrigerated, to chromatography column 1 quartz sand color without considerable change and in water outlet Fe content (complete after about 96h) without when obviously reducing, stop (finally completing in-situ oxidation plating iron arsenic removal work), obtain arsenic removal post (chromatography column of band quartz sand after treatment).
Two, effect of removing arsenic monitoring
(1) in the arsenic removal post prepared, the deionized water rinsing arsenic removal post of at least 10V hole (i.e. 1.21L, 168min) is continuously pumped into the flow velocity of v1=7.2ml/min;
(2) do not change water inlet speed, continuing is the simulation high-arsenic underground water (Na of 3000 μ g/L by As concentration
2hAsO
4solution) pump in arsenic removal post, water outlet is collected one every 1h and is gone out water sample, and adds 1-2 respectively and drip the pure dense HCl of top grade and be acidified to pH and be less than 2, lucifuge stored refrigerated, in 72h, carry out As concentration determination with Atomic Fluorescence Spectroscopy (AFS) (AFS);
(3) As content in water sample (totally 1152) is detected respectively with Atomic Fluorescence Spectroscopy (AFS) (AFS-9700).
From the Na of arsenic removal post
2hAsO
4break-through curve can be found out, be that the Na2HAsO4 solution of 3 000 μ g/L is about 26h (11.2L when being continuously pumped into As concentration with the speed of v1=7.2ml/min (namely longitudinal flow velocity is ν L=0.45cm/min), 93.3V hole) after, As (see Fig. 2) is just detected gradually in the water outlet of arsenic removal post, now the high-arsenic underground water (As concentration is 3 000 μ g/L) of about 11.2L is purified by arsenic removal, and water outlet can reach China's life standard for drinking (<10 μ g/L); About 35h (15.1L, 126V hole) afterwards As just penetrate completely.Its effect of removing arsenic is good, is suitable for practical application and field is promoted.
Claims (3)
1., based on the in-situ oxidation plating iron arsenic removal process of quartz sand load, it is characterized in that comprising the following steps:
(1), to quartz sand, chromatography column pre-treatment is carried out, stand-by;
Prepare in-situ oxidation plating iron arsenic removing apparatus: be cavity in chromatography column, filled stone sand in cavity, the bottom of chromatography column is provided with bottom, bottom is provided with outlet, exports and is connected with rising pipe, and the top of chromatography column is provided with top cover, top cover is provided with entrance, entrance is connected with the outlet of liquid-inlet pipe, and liquid-inlet pipe is provided with peristaltic pump, FeSO
4naOH solution tank NaOH, deionization water pot, NaClO NaOH solution tank NaOH are connected with the entrance of liquid-inlet pipe respectively by arm, and all arms are provided with valve respectively; FeSO
4naOH solution tank NaOH is built with FeSO
4solution, deionization water pot is built with deionized water, and NaClO NaOH solution tank NaOH is built with NaClO solution;
(2), the valve of closing on the arm that is connected with deionization water pot, NaClO NaOH solution tank NaOH, open and FeSO
4valve on the arm that NaOH solution tank NaOH is connected; By peristaltic pump with V
0=12.1ml/min water inlet speed pumps into 2mmol/LFeSO in chromatography column
4solution 1min;
(3), closedown and FeSO
4valve on the arm that NaOH solution tank NaOH, NaClO NaOH solution tank NaOH are connected, opens the valve on the arm that is connected with deionization water pot; In chromatography column, pump into anaerobic deionized water with identical water inlet speed, the time is 1min, as reductive agent FeSO
4with the buffer medium of oxygenant NaClO;
(4), closedown and FeSO
4valve on the arm that NaOH solution tank NaOH, deionization water pot are connected, opens the valve on the arm that is connected with NaClO NaOH solution tank NaOH; Do not change water inlet speed, in chromatography column, pump into 1mmol/L NaClO solution, the time is 1min, and by chemical reaction equilibrium, NaClO solution is excessive pumping into, and makes it to be enough to Oxidation of Fe
2+form iron oxides/hydroxides;
(5), closedown and FeSO
4valve on the arm that NaOH solution tank NaOH, NaClO NaOH solution tank NaOH are connected, opens the valve on the arm that is connected with deionization water pot; Do not change water inlet speed, again in chromatography column, pump into anaerobic deionized water, the time is 1min;
(6), be cycled to repeat the individual step in above-mentioned (2)-(5), to chromatography column 1 quartz sand color without considerable change and in water outlet Fe content without when obviously reducing, stop.
2. the in-situ oxidation plating iron arsenic removal process based on quartz sand load according to claim 1, it is characterized in that: step (1) is described carries out pre-treatment to quartz sand and be: described quartz sand, (1), particle diameter are at 1mm and epigranular; (2), before carrying out filling out post, 3 times are cleaned respectively with tap water and deionized water with after 6mol/L HCl soaking and washing 12h, to remove impurity and the ferriferous oxide of quartz sand surface, after repeating this step 2-3 time, clean quartz sand is proceeded in deionized water and saves backup.
3. the in-situ oxidation plating iron arsenic removal process based on quartz sand load according to claim 1, is characterized in that: step (1) is described carries out pre-treatment to chromatography column and be: described chromatography column, (1), diameter 1.4cm, height 30cm; (2) chromatography column mass concentration be 15% ~ 20% dilute hydrochloric acid soak and to use tap water and washed with de-ionized water 3 times after 48h respectively.
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Cited By (3)
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| CN104741099A (en) * | 2015-03-27 | 2015-07-01 | 环境保护部环境规划院 | Preparation process of quartz-sand-loaded in-site oxidation iron-plating arsenic removal column and water body arsenic removal method |
| CN107876561A (en) * | 2017-12-12 | 2018-04-06 | 湖南师范大学 | The method that original position removes the post loading system of soil arsenic pollution and removes soil arsenic pollution |
| CN108452768A (en) * | 2018-02-26 | 2018-08-28 | 中国地质大学（武汉） | A kind of arsenic removal filter core and its manufacturing method based on sintering processing technology |
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Cited By (3)
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| CN107876561A (en) * | 2017-12-12 | 2018-04-06 | 湖南师范大学 | The method that original position removes the post loading system of soil arsenic pollution and removes soil arsenic pollution |
| CN108452768A (en) * | 2018-02-26 | 2018-08-28 | 中国地质大学（武汉） | A kind of arsenic removal filter core and its manufacturing method based on sintering processing technology |
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Application publication date: 20150506 |